| Newbie with a question. [message #94342] |
Thu, 12 August 2004 07:10  |
Radhika
Messages: 12
Registered: June 2001
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Junior Member |
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I'm new to PRO*C development and am having trouble following a tutorial. Could anyone please help me with the following questions?
(1) What exactly is a MACRO? I was told that we use #define to define constants and macros. However, I'm not sure what a MACRO is?!
(2) I have a variable defined to be
static NUMSTR empdtls="";
I understand that defining a variable as STATIC is akin to making it public. Why do we have the "" here? What is a NUMSTR type of variable?
(3) Is TABLE a PRO*C reserved word? I have the following definition:
table(T_DEFINE,1,13,73,NULL);
table(T_DEFINE,5,1,5,38,40,43,45,48,50,53,55,58,60,63,
65,68,NULL);
table(T_BEGIN,1);
How do I interpret this code?
(4) if ( !mode )
{
EXEC SQL OPEN cursor_001;
POSTORA;
}
The term 'mode' however is NOT defined ANYWHERE!!!!! What exactly is happening here?
Thanks for your time and help. I would also appreciate any links to a good PRO*C tutorial.
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| Re: Newbie with a question. [message #94343 is a reply to message #94342] |
Thu, 12 August 2004 09:43  |
RBARAER
Messages: 1
Registered: August 2004
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Junior Member |
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I fear I will not be able to help you on PRO*C, but I can help you find documentation. If you're working with an Oracle 9i Database, go here : "http://www.oracle.com/technology/documentation/oracle9i.html", and download the whole Oracle 9i documentation : "Oracle9i Database Release 2 Documentation Library" (there is also a link to 10g doc). You will find documentation and a Pro*C tutorial in "Pro*C/C++ Precompiler Programmer’s Guide" (open "booklist.pdf" once the download is completed).
I hope this will help you,
RBARAER
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| Re: Newbie with a question. [message #94347 is a reply to message #94342] |
Mon, 16 August 2004 23:40 |
Jai Vrat Singh
Messages: 205
Registered: September 2002
Location: Singapore
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Senior Member |
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(1) Macro is a name given to a peice of code using #define . It gets replaced verbatim by the preprocessor before the actual compilation begins.
-- please read some standard C programming book to get details.
(2) STATIC does not make anything public, but it is opposite. The lifetime of the static vaiable is the whole program but the scope is file scope or function scope if defined inside a function.
NUMSTR may be a typedef in the headers( .h files) which you have not explored but you hae included in your program.
"" is empty string intialization. You can use this to search in the location where you headers as kept.
grep NUMSTR *|grep typedef
(3) TABLE is a keyword but may be a function call here as it is without an EXEC SQL statement before it.
(4) mode ..something same as NUMSTR.. hidden somewhere in your header files.
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